/*
=== Task 4 - Potentiometer Dimmer With a Low-Brightness Warning ===
                    Author: Roberto Palozzo
===================================================================
*/

const int potPin = 1;                               // potentiometer wiper connected to GPIO 1
const int ledPin = 9;                               // dimmable LED connected to GPIO 9
const int warningPin = 10;                          // warning LED connected to GPIO 10

void setup() {
  pinMode(ledPin, OUTPUT);                          // set the dimmable LED pin as an output
  pinMode(warningPin, OUTPUT);                      // set the warning LED pin as an output
  Serial.begin(115200);
}

void loop() {
  int potValue = analogRead(potPin);                // read the potentiometer (0 to 4095)

  int brightness = map(potValue, 0, 4095, 0, 255);  // convert the reading to PWM range (0 to 255)

  analogWrite(ledPin, brightness);                  // set the dimmable LED's brightness

  // turn on the warning LED whenever the brightness is too low to be useful
  if (brightness < 25) {
    digitalWrite(warningPin, HIGH);
  }
  else {
    digitalWrite(warningPin, LOW);
  }

  Serial.println(potValue);                         // raw potentiometer reading
  Serial.println(brightness);                       // mapped PWM value

  delay(100);                                       // small pause: keeps the dimmer smooth while the Serial Monitor stays readable
}